<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-inline-3/#baseline-source">
<link rel="author" title="David Shin" href="mailto:dshin@mozilla.com">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<meta name="assert" content="<textarea> with baseline-source: last generates sensible baselines.">
<link rel="stylesheet" href="/fonts/ahem.css">
<style>
.target {
  inline-size: 200px;
  padding: 10px;
  border: solid 3px;
  position: relative;
  line-height: 0;
  font-size: 20px;
  writing-mode: vertical-rl;
}

.inner {
  border: solid 5px;
  padding: 10px;
  baseline-source: last;
  font-size: 30px;
}

span {
  display: inline-block;
  width: 1em;
  height: 1em;
  outline: solid cyan 3px;
  outline-offset: -3px;
}

textarea {
  border: solid 5px;
  width: 60px;
  height: 60px;
  vertical-align: baseline;
  font-family: Ahem;
  line-height: 1;
  margin: 0;
  padding: 0;
}

</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<body onload="checkLayout('.target > *')">
<div class="target">
  <span data-offset-x="45"></span>
  <textarea data-offset-x="10" class="inner"></textarea>
</div>
<div class="target">
  <span data-offset-x="45"></span>
  <textarea data-offset-x="10" class="inner">X X X X X</textarea>
</div>
<div class="target">
  <span data-offset-x="45"></span>
  <textarea data-offset-x="10" class="inner" placeholder="X X X X X"></textarea>
</div>
<div class="target">
  <span data-offset-x="45"></span>
  <textarea data-offset-x="10" class="inner" style="font-size: 100px;"></textarea>
</div>
<div class="target">
  <span data-offset-x="45"></span>
  <textarea data-offset-x="10" class="inner" style="font-size: 100px;">X X X X X</textarea>
</div>
<div class="target">
  <span data-offset-x="45"></span>
  <textarea data-offset-x="10" class="inner" style="font-size: 100px;" placeholder="X X X X X"></textarea>
</div>
